rtlx.h

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/*
 * Copyright (C) 2004, 2005 MIPS Technologies, Inc.  All rights reserved.
 *
 */

#ifndef __ASM_RTLX_H_
#define __ASM_RTLX_H_

#include <irq.h>

#define LX_NODE_BASE 10

#define MIPS_CPU_RTLX_IRQ 0

#define RTLX_VERSION 2
#define RTLX_xID 0x12345600
#define RTLX_ID (RTLX_xID | RTLX_VERSION)
#define RTLX_CHANNELS 8

#define RTLX_CHANNEL_STDIO  0
#define RTLX_CHANNEL_DBG    1
#define RTLX_CHANNEL_SYSIO  2

extern int rtlx_open(int index, int can_sleep);
extern int rtlx_release(int index);
extern ssize_t rtlx_read(int index, void __user *buff, size_t count);
extern ssize_t rtlx_write(int index, const void __user *buffer, size_t count);
extern unsigned int rtlx_read_poll(int index, int can_sleep);
extern unsigned int rtlx_write_poll(int index);

enum rtlx_state {
    RTLX_STATE_UNUSED = 0,
    RTLX_STATE_INITIALISED,
    RTLX_STATE_REMOTE_READY,
    RTLX_STATE_OPENED
};

#define RTLX_BUFFER_SIZE 2048

/* each channel supports read and write.
   linux (vpe0) reads lx_buffer  and writes rt_buffer
   SP (vpe1) reads rt_buffer and writes lx_buffer
*/
struct rtlx_channel {
    enum rtlx_state rt_state;
    enum rtlx_state lx_state;

    int buffer_size;

    /* read and write indexes per buffer */
    int rt_write, rt_read;
    char *rt_buffer;

    int lx_write, lx_read;
    char *lx_buffer;
};

struct rtlx_info {
    unsigned long id;
    enum rtlx_state state;

    struct rtlx_channel channel[RTLX_CHANNELS];
};

#endif /* __ASM_RTLX_H_ */